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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '039600d8774031a5ac9aa73eca0e4724db75b462077b81a409acd95a6e44d9bf' 
  AND token = 'nfYJKk+mJanD4AFd9dn4e01C2JhmK8krqSDjuC9CcfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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