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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd862c19a0572856af5f880d294059d6fed65e7266f6687ffa190b254af4c5ed1' 
  AND token = 'u2aPu+zD4a81Y0CkjRGdWG+bS+2KLP8SxAFb0tSyc9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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