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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c47624053ce871ee1d3db32e9c15fd723386dff4b73463b0a47dad411a7f12c' 
  AND token = '3b/tCRDw5HOhgcIh3cfr24JoWrQnzT2U+DNKK9WWf4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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