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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390257c48ea7cb061aa54c0aee85318a5e4ef220dac55167e641868a234629e9' 
  AND token = 'cP6UDcJMuLjVXJOjh0U94dkQeCuU7ggHi3MkLasksKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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