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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3773ad10f63aa9ffc6d86c865bae084aea204b18adad10de649c4abbd178401f' 
  AND token = 'yr3jUsgVbE2kNVc0ewvjI2thpEb0yn5oDFLRur02T3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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