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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89dd9bedd8f22c6e4ed969ad8555024d79f76ada374b30802e9a447bb65fec9' 
  AND token = '+5o7w+0la8F5wjcpD0N1VbOwA1Z5bZRr21YdrD5MyQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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