SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2a287cc67ce68958502c1b71e840dc3d7eb87fa7fd24771ebf3bd24b031694' 
  AND token = 'Vb80G0w5ZGfyDzplICgscnijOC1+h+mKQsrFYofDa5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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