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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f16b6b3ea2f3f3895477fea5f0ea77502b75081871e2fc082b938a14722291b0' 
  AND token = '5zDBnaIYi8vfW3ByHxP1dQM2cFVDKKlI4gev1V7WOv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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