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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '682d3bddc13ec0710515175be7dadb0600a2b2f0b28a9c8df06c14f61d91b6d1' 
  AND token = 'kKp8IZkmjdeXDeQ47XaL62yebACqa3o3lpj2dnrgYos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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