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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766caf43682d95566025f698f9ca47032d7349fd9c9ff1c29a4275720a059180' 
  AND token = 'SNxVtJaNe29gR7LtFOeCKjfhFj+YPl0Is3qjazQeDaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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