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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fb7fea16b73d632635649d3a4092a216c63f0d89fd3becd099b46cf17913f2' 
  AND token = 'v4O7BlrzVn0aTg1KIt+UNhcT52fs6sA1oOg+ThWLWrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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