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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809c5aa7727f13196b27d6549d061c8ba831ab9b1a4e3070418e4b36921ea2a9' 
  AND token = 'mQXsClnh5Brv49DsUbbxh9HkIRd82iZQwzpfv4Zq8yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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