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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98af03ab937f28c962472cbc57e82132db352b75ff268120af201687e1c2ac5e' 
  AND token = '5MwG16QhaKMx4W9YYC1Ws5kApQr6UX8AZeHvXveokK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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