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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa48c318ae8eb3a4ea093e7c5563319c3f99e1bc79123fa6e256b3c7eab21da' 
  AND token = '2Kr6OLi1JlbP8icjE+Otfl8ZmfsBztQngNFB+dfKguE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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