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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de0ea2b50a7e260aa59b3d7165f935077dce0a5d2964d0fce0409ef44581767b' 
  AND token = 'rC9xrk5kUTX7sG303hs53o3W9xr3iy3o5a7hh8mftxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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