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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d7d361e30526d90c2c3c3084f715648b5e565f59d0193afab839564bfa72d63' 
  AND token = 'KZpci6N3kzeIqfFaKlOlELMGMO6Vq4MHhmdpSX6b2Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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