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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff2e61352403bc89c93a14da80e0da89802ec0ea1ebe65fa50243f9451e1dd05' 
  AND token = 'afUH0RULr1mO/Mv5ChfzYP+aBPckBVZeFxgXLDnc9vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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