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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ca9ae95bcd28e06efa115bf2c46e1546b4088d6c38359b91780e890431c40e' 
  AND token = 'XfXmL6zdvIvesQUG1ukbkHnNRF27AkCfuj7/qDojQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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