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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1061cd28cdc62725d4abf4f011c1c023b5190192d656e014c0db35a7aedef984' 
  AND token = 'Nailc0AjmBxdMYXet1ClT4h4veV3EYu9M2D9WvOYlyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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