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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112ebcf5e1a720044c08bad49c2836842451e85eb6e259609aed3f7f69277b8f' 
  AND token = 'KeuwsIv1wx1i1yhcYtuJO+vXJGz8ZV5oeFNw4E0tlV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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