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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '572af7433a7a9e12849e4e5fd58171bde2b2189c02c8dccd953917a946eb8b36' 
  AND token = 'iC7dbYYVHqAe/HMwzPfN9dBVSzNAmpDezhZU5u2mK78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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