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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e018ff8e872f4805b94da7f2258fbe32eb3f6272811e7793e0cc62c317ae76d2' 
  AND token = '0W9Y7Wc8Q2OBysQYk3xSjLqt1mt4k2bUzCU8vu6A84g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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