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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8391986297c4e996fd76f0d6bc28cb9f1c6621fe1e114b06bd0bc1a4e0cdec' 
  AND token = 'Sm6/QKjBC69MHmTtoGPKjnKU92SDzDTvp3s0GTPBzLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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