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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d3d7bce270ac9baeabe82f25912053391b594ba333d340489791d34159714d' 
  AND token = 'VdFyvp31cMvtD8FBgL3Opn8LOjvCFJ7M4UojisgiP+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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