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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa10231a263b6f2a60015883990ec0b6adf6ec4a2247431a7dbf3e87f189902' 
  AND token = '8nCjS4KQRJL3MU2QDDHMP5GAR66w4al95RNrwqCMoVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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