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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7725ff724ce6e6fc0f55172b3915cdebee2e265dd00545dee693ccf5c2d8a9b' 
  AND token = 'T2+9+b9AA3mZAlKYnM62KkNCJlS95ZGreZp7eYtmXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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