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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10923c6bb02247ef0be08027db8ae221c24b762e04795b63578fed7d6879652' 
  AND token = '0A4NuOI6jdwl7L3CjmrPBxBoLrPTd/IFrtwJDVkKxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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