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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce9d7d6406d07f55d542211b58178f71ebc02ddb842c16c9c913dc34fe1b524' 
  AND token = 'cT/6hrbXJ/90LsFNpXupH/65+BuBpNtATC6RS/7bdBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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