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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f3abcca39f5a6aa3f71ed959e14e600f2a0fa0cbfebdeae591f59712650eca' 
  AND token = '1BzSJB3buUpnYd/umNy5e42ey4pty8V0IQN6TZQVioQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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