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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac64ebfa4d4f6707fa3cf70aedcc6dc2623ec158b1556241c7ee51c3af051e6' 
  AND token = '51MKjc88AjhXS2lrayl0Ff5x+EWRzWg5RpD5zgxwTKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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