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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8027676457e084eea60bf6f1cedee4755777dee8263c5045a3d7430380e4db0f' 
  AND token = 'WTXdfNvefRadZD4jvXvVZ5F0LZC57Tjb+lvmBBPF5nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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