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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0de2778c32d84d8629810e9bdf8834495c9d9b32fbc8f877ab1a08dc714178' 
  AND token = 'wnl+1bK+AAgQcnEVjUy8H4CIbsZ9ebfcGbFr7jJCrfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}