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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe2fd5706868e4b6d036419e6c60b4c0696dbb6176c47cd1d92353bc3f564e1' 
  AND token = 'v2Muc/j703vK3FbDaOAkCH3adqu6UQJaXbUBXmMC0zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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