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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18efc6fc7854bd96f5df180f283d59cde19d780c15862612f63f28e0bc8ed9e4' 
  AND token = 'dJeHLz/3jbRQLJN1qlECe5WU4X/XRTViKegxL6ZPXcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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