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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ab3df09154eebab6563f09fbd74c7bf6b0ded96bd659c405423e6d409fef17' 
  AND token = 'SWxg1gtt1J50Vq1GuPVl3O0W42ANt9Il1FeKSoYW5kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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