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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7410f279fd762a1cb27d6ea1ce78e4c6dd4502ff4b34af2bbfe78e1c1e4dadf5' 
  AND token = '2q+VHONa1gfBO5vzWHjamgdo6N2nkuv1xQeCwLN6BHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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