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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30be16dbe8dd07dd3ec55bf066c60e1f9f9e23b3cccf15d5b0a91224e8c0ff6c' 
  AND token = 'K6N2fEyn4N0uCM2Uawe6E/HVesHkI5w/PMCptZWtrdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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