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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d407ed8963b3ae1ed3bb6c4c8c4575c017c22f347f73909bdad64b648cd08e5' 
  AND token = 'WUP9e8OMx038BMCbeGOmG5iu5XXKjazQLMz800LZREc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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