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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '757701be8cd513864e89da22f3c9593c6739f23b05e90e957cf61e8c2ee71632' 
  AND token = 'ZkoD1JTluG5Bj9FjN3fWedbOXcZcBlDfXEmBTK979bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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