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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ca28bc8e1fb149a2f4f4377fce189830dae0efb8253c0e436f425751f1a9fb' 
  AND token = '5d8vWugwTin8bJoCTTeJ23i41a+rQ5Wh2Dzzzme6XCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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