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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b03acd7a6ff58aa8731e4b2ea53edb8cc1346d3405fc61228d6072b559648a3b' 
  AND token = 'chBF2xO39pPaqHepWKAomf8FNQv8t3tof7QdoGJ55JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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