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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebd147860043e3bb4cf1fc67d4c26946f4d1d72a1dc01ae45fbf5d3823c9b3a' 
  AND token = 'G+WyehWvOvREa0d3obiLAGw0r5qFq1nzXJ9MDj8kbnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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