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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75718b8ee55ded4e03433d2ba6c2413d43b8e28e8de1f62a096fedfb3de6f9f8' 
  AND token = '4Jve3EFebgEhTAxxcZ1Q+a5LGObMeMR3foS8QmIOqNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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