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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b6f3a8b1cb150a912740a6fc1ed05576d273bb07fa5446826aa57452ec8117' 
  AND token = 'KiMhR5ipijvHN4iK0vTIXkQ1D0HkII8gjbh03Ho9BzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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