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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd249a1de3688eef9d08562cad5812b04185770e84c7badd9cc1574115140caf6' 
  AND token = 'UlT3BN2r5TGYxUjZ9fa8GtZVbYIPDT7TC25Il6kaJzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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