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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41202fccacb2eb8c5a2999b880d6bd9a00c597f514ea0998f08638d15afdff5' 
  AND token = 'm5DFe8HFmjZcXbUZ5eU80B4gb6J9FzMiNlKZpvOcdxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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