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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1bdf58a6a2f23b69ac2c2f6221b79e841698aa5b4cfba1d5407e76d11308e4' 
  AND token = '/dlQ54RilAUpTnHbFaEvwW9f57MY8E8eITSHzOocjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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