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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e117007b2c099792afcfed03fe44e107b77e8c4c25f29e9346923e8009c7c66' 
  AND token = '5tcgjZ9U+fKKzReeFgCOjzUqoczj+HBRzWGXJpGqC7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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