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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0c89159292fd13f54aba88abfcff4e2843ce7471c8d65a3409e877d0dcecd2' 
  AND token = 'h3YF1Gu+uLW7YrouL78F9Thg1Icr7ey36gatwOYr42Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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