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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf07c31a8979926643cf4022dde7190ae9c38086b7e6414432a45b282d7b608' 
  AND token = '8xjmbEzZGwLl8UqjLZJ9JMHWgSfnMCeC2nNH1A/46A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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