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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd230edcbebc62fba95491acfab85e247911486d9a5a0fd7b5c4fa0a0b820b2c' 
  AND token = 'b+sU3vUUEexepf6nnsKr9iHmjspbas8r00k51PKJx/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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