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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743fa7cb52f16dda7b06289dc3786c37a8dd37578cbbec6efa1b8dbb0caa443e' 
  AND token = 'NmsMWcqH1gwToyxZptf50Ztqs+331/KeGJ/s2Iq7XBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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