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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cc55ece27568ae61cdaec3aaa3755e6e1e4f916855387e8ad41ef8688201ff' 
  AND token = '86C1EhZ4rB11cop+Ut5M8rCaVGPKctMp7SWKzq9pXJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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