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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9989d19b20fb3aa1196e0e28a977107d59086b814fc58b6e473c11ed206694f1' 
  AND token = '8tdLc9lNZHdVccaF26firokZ+fgqP+19bELq4xO4E9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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