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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5694d0c3e8bc901cf3bba40e967bc4b4a398a478b6365d8b8cee4a9597beea5a' 
  AND token = 'wFpxQZluGKs39syZ8+thWDgzR67kuq2i1+2ayE6Ff4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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