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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15ab2c9855e86f54b3b4473e7f945cead5464e8e018c26dea90ad835d7ed45e' 
  AND token = 'AtaAE4J66sJyHONY51JgATh5evjxsCEl/gbgEGY8odE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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