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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440b00a8d26651a04917ed5835dd96f0136a2c7a6e1df1aa9c8476a524b58de1' 
  AND token = 'P3stR6qOaNsFwyZ0z6EwU/5Kyu+OciOxm3aXAonQnl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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