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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0526a1562252de9407287e3aef47e6a8d5dbc1dd0d459c099052003006329766' 
  AND token = 'SCqKCfPfoy5WzFn81vfZOLGnDZ7byLHf0nJ1zosB4lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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