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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb70714cd443cfe86bf6f64f310e17201fa29c5613360cd3c0b9d4df9fcea32' 
  AND token = 'uAZrxGmWZteSPfhkxPLKz9VXcMjOMQLgl3P7LAKlO4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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