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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36709e5bddead121a3771143192aa00a1bd18c0cf0f5decfc32acb66317f38b1' 
  AND token = 'Ej9YwoJ2RLU8W1L1/NWzKeWXbtVBk59pg52KTnKC87E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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