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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938f824090c666a5a244bb31230cacac5a31bec5397ea7580729d34685c8ddff' 
  AND token = 'ggI8L+zg+RmAXFT7BWl9OB0U1q+LnqlERQ0Ic1+mbMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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